Safety lock for window sashes



Dec. 5, 1950 E. A. BARNES SAFETY LOCK FOR WINDOW SASHES Fil ed Dec. 23,- 1946 Em mci'i'fi. Barnes Patented Dec. 5, 1950 UNITED STATES RATIENT I I 2,532,881

Sll l -ETY -lif)CK FOR WI-ND'IJWSASHES" Emmett A. Barnes, Marietta. Ohio Application December 23, 1946, Serial No. 718,007

1 Claim. 1

The present invention relates to a device for locking upper and lower sashes of a window when open and thus preventing the entering of unauthorized persons from the outside.

This safety lock is intended for retaining the two sashes in relative open position whether the top or the bottom sash has been shifted. The device is secured on the inside of the upper sash and consists of a bracket with an upper and a lower hinge lug for engaging a bolt slidable ver tically but non-turnable therein, when in locked position.

Objects and advantages of this invention will be found in the subjoined description aided by the attached drawing in which Figure 1 is a fractional, perspective view of a window partly open and secured by my safety lock; k

Figure 2 is a similar view of the window closed and the locking bolt partly displaced either in action of insertion or withdrawal; and

Figure 3 a perspective view similar to Figure 2 but with the locking bolt completely removed.

In the drawing like numerals relate to the same details in the diiferent views.

Reference numeral Ill denotes the upper or outer sash, and numeral II the lower or inner sash. On the inner surface of the left side bar of the upper sash I is securely fastened, as by screws I2, a bracket I3 provided with a top hinge lug It and a bottom hinge lug I5. These lugs are intended to carry in upright position a straight locking bolt I6, having a head I! at its top and being turned cylindrical at its bottom at it, as well as at I9 immediately below the head 51'. Between these cylindrical portions the bolt is provided with a straight, wedge shaped. key or ridge 20. The upper hinge lug I4 has a corresponding V-shaped key-way 2| in its bolt hole, which is of a diameter to fit around the cylindrical neck l9 of the bolt I6. Likewise the tip I8 of the bolt being also cylindrical fits in a round hole 22 of the bottom hinge lug I5. It will thus be seen that the bolt I6 can be turned in both lugs I4 and I when fully down in position.

A locking arm 25 has a downturned heel reaching inwardly from the axis of the bolt Is to contact with top cross bar 21 of the lowersash II. This locking arm has a boss 28, having a round hole 29 fitting the tip I8 of the bolt I 5. The hole 29 has a V-shaped key-way 30 for the key 20 on the bolt I6, thus permitting sliding action between the bolt I6 and the locking arm 25.

It will be noted that the length of the cylindrical neck I9 is only slightly more than the thickness of the upper hinge lug I4, while the cylindrical tip I8 must have a length somewhat greater than the added thickness of the lower lug and the arm hub 28. This .will permit the turning of the bolt It in the lugs [4, I5 and the hub 28 when the parts are assembled and the sashes closed but at no other time, because in any other position of the parts the bolt is prevented from turning by being keyed in the keyway 30 of arm 25, while the latter is prevented from turning by the flat side surface'3I on the arm 25 which abuts against the flat surface 33 of the bracket I3.

In assembling the parts of my safety lock, the bracket I3 is first secured on the upper sash III while the window is closed as in Figure 2, thus the arm 25 is placed in position over the lower hinge lug I5 with their holes 22 and 29 in axial alignment. Thereupon the bolt I6 is extended thru the hole 2I of the upper lug I4, care being taken that the key 20 enters the keyway 2|, after which the bolt I6 is pushed straight down all the way, in engagement with the lugs 24, i5 and boss 28.

In this position the bolt I6 can be turned so that the key 20 no longer points towards the bracket face 33 but instead in the length directicn of the arm 25 so as to register with the key way 3!! therein and at the same time locking the top of the key 20 under the lug I4, thus locking the key from withdrawal.

It will now be possible to open the window by either pushing the upper sash I0 down or the lower one II up as seen in Figure 1 after having first shifted the locking arm 25 on the rod I6. The heel 2'6 will then abut against the top bar of the lower sash, thus preventing any further opening of the two sashes.

It is to be understood that the invention as herein disclosed may be varied from the details described and shown without departure from the spirit of the subjoined claim.

I claim:

A safety lock for sliding sash windows, comprising a bracket adapted to be secured to a vertical side of the top sash and having two vertically spaced lugs arranged to position over the bottom horizontal rail of the sash, said lugs each having an opening therethrough, the lug openingsbeing vertically aligned, the opening of the top lug having an offset portion, a bolt extending thru the openings of and coupling said lugs, a key extending lengthwise of the bolt and tera portion of each end of the bolt of circular formfor turning in a lug opening, said key being slidable in the ofiset portion of the top lug, the circular end portion at each end of the bolt being in a lug opening when the bolt is extended downwardly to the limit of its movement thru the lugs whereby the bolt may be turned to move the top end of the key from alignment with the oifset, and a locking arm having a circular opening in one end to receive the bolt, said arm opening having a key way, the arm being of a length to extend from the bolt across the top rail of the lower sash, the arm in its lowest position on the 4 bolt engaging the circular lower end portion of the bolt whereby the bolt may be turned to locate the lower end of said key over the arm out of line with the arm opening key way.

EMME'I'T A. BARNES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,55 ,351 Setterstrom et al. Sept. 1, 1925 1,677,300 Segal July 17, 1928 

